<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        background: #333;
      }

      .map {
        width: 747px;
        height: 617px;
        background: url(./img/map.png);
        margin: 0 auto;
        position: relative;
      }

      .city {
        position: absolute;
        top: 227px;
        left: 540px;
      }
      .guangzhou {
        position: absolute;
        top: 530px;
        left: 550px;
      }
      .taibei {
        position: absolute;
        top: 495px;
        left: 660px;
      }

      .dott {
        width: 10px;
        height: 10px;
        background: skyblue;
        border-radius: 50%;
      }

      .city div[class^="pu"],
      .guangzhou div[class^="pu"],
      .taibei div[class^="pu"] {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 10px;
        height: 10px;
        box-shadow: 0 0 12px rgb(0, 157, 253);
        animation: move 1.2s linear infinite;
        border-radius: 50%;
      }

      .city div.pu2,
      .guangzhou div.pu2,
      .taibei div.pu2 {
        animation-delay: 0.4s;
      }

      .city div.pu3,
      .guangzhou div.pu3,
      .taibei div.pu3 {
        animation-delay: 0.8s;
      }

      @keyframes move {
        0% {
        }
        50% {
          width: 40px;
          height: 40px;
          opacity: 1;
        }
        100% {
          width: 70px;
          height: 70px;
          opacity: 0;
        }
      }
    </style>
  </head>

  <body>
    <div class="map">
      <div class="city">
        <div class="dott"></div>
        <div class="pu1"></div>
        <div class="pu2"></div>
        <div class="pu3"></div>
      </div>
      <div class="guangzhou">
        <div class="dott"></div>
        <div class="pu1"></div>
        <div class="pu2"></div>
        <div class="pu3"></div>
      </div>
      <div class="taibei">
        <div class="dott"></div>
        <div class="pu1"></div>
        <div class="pu2"></div>
        <div class="pu3"></div>
      </div>
    </div>
  </body>
</html>
